Vitamin B1 (thiamine) organic compound molecule

Caption: Vitamin B1. Molecular model of thiamine (C12.H17.N4.O.S), also called thiamine and vitamin B1. A deficiency of this vitamin leads to a disease called beriberi. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and sulphur (yellow). Illustration.